SmogRank / World / Mexico / September 2023

Most people breathing unhealthy air in Mexico, September 2023

15 cities in Mexico measured at 2 or more places, ranked by how many people breathed unhealthy air on an average day over the 30 days. The most people breathing unhealthy air: Zapopan, Mexico, about 158K on an average day. A city needs measurements on 70% of the days to be ranked.

About 336K people in these 15 cities breathed unhealthy air on an average day of September 2023.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

← Zapopan 158K 100K0
Every city in Mexico ranked for September 2023 with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1ZapopanJalisco
    158K
  2. 2TlaquepaqueJalisco
    100K
  3. 3Ciudad NezahualcoyotlMéxico
    43.1K
  4. 4MexicaliBaja California
    34.4K
  5. 5GuadalajaraJalisco
    0
  6. 6Ciudad JuárezChihuahua
    0
  7. 7Santa CatarinaNuevo León
    0
  8. 8CelayaGuanajuato
    0
  9. 9PueblaPuebla
    0
  10. 10Mexico CityMexico City
    0
  11. 11MonterreyNuevo León
    0
  12. 12León de los AldamaGuanajuato
    0
  13. 12Ciudad General EscobedoNuevo León
    0
  14. 14Santiago de QuerétaroQuerétaro
    0
  15. 15Pachuca de SotoHidalgo
    0
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, September 2023 · Mexico now

Regions

Baja California 2Chihuahua 1Coahuila 1Guanajuato 7Hidalgo 3Jalisco 3México 6Mexico City 1Morelos 1Nuevo León 8Puebla 1Querétaro 2Sonora 1

Ranked cities in each region, September 2023.

Use this board

SmogRank, most polluted cities in Mexico, by people breathing unhealthy air, PM2.5, September 2023, smogrank.com/mx/history/2023-09?by=people (accessed 7 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.